Diogenes Laertius: Lives of Eminent Philosophers, Vol. 2 (Loeb)

He was himself nicknamed "the pure hound." original: "Ἀπλοκύων" And he was the first, as Diocles says, to double his cloak, using that as his only garment, and to take up a staff and a wallet. Neanthes also says he was the first to double his mantle. Sosicrates, however, in the third book of his Successions, claims that Diodorus of Aspendus was the first to let his beard grow and use a staff and wallet.

14. Of all the followers of Socrates, Theopompus alone praises him, saying he had great skill and could win over anyone he pleased through agreeable conversation. This is clear from his writings and from Xenophon’s Banquet. He seems to have been the originator of the most manly section of the Stoic school, about which Athenaeus the epigrammatist writes:

You who are experts in Stoic lore, you who commit to sacred pages
these excellent doctrines—that virtue alone is the good of
the soul; for it is virtue alone that saves both the lives of men and their cities.
But that Muse, one of the daughters of Memory, Referring to the Muses, specifically Erato, who represents pleasure.
approves the pampering of the flesh, which other men have chosen for their aim.

15. He was the precursor to the indifference of Diogenes, the self-control of Crates, and the hardihood of Zeno, having himself laid the foundations of their way of life. Xenophon says he was the most pleasant of men in conversation and the most temperate in all other things.

His writings are preserved in ten volumes. The first includes: